Thanks for the reply, Sean! I should have been more specific.
The data I am loading is not an image file. It is a string. I am
loading a file with 3 images compressed together. Then
decompressing it using lingo into a string. Then I want to use that
string to draw my bitmap using copypixels. I can do it buy going
through and using setpixel to draw each pixel. But that's too slow.
I want to use copypixels.

the major problem is that copyPixels works with image
objects... you need to have two image objects in Director....
there's no problem with this part of your pseudocode:
img = image(200, 200, 32)

but there's a bunch of steps not showing here:
img = String(myData)

and, in fact, that line simply shows the data being converted
to a string. It has to get into an image object before copyPixels
can be used, ie. if you import an image into a cast member by using
importFileInto() or the .fileName parameter of a member then you
will have your image object in Director ready to manipulate with
copyPixels.

Hey, Chunick. Thanks for your reply and for the link. You
have a lot of awesome examples and I bookmarked that page. What you
suggested totally makes sense. But I'm afraid that I was unclear
about what I am trying to do. What I would like to do is this:

Have information sent over the server (such as Flash Media
Server). Decompress that information using an algorythm such as
GZip. Make it into 3 separate images. Copy those images onto the
screen.

Since I may not even be dealing with a file, I can't just use
the .fileName property. Also, I need to parse the data before it's
usable as image data.

Why do I want to do this??? Well, what I am trying to do is
make a 4-way scroller using a tilemap. Each tile needs to load: an
8-bit alpha channel, an 1-bit bitmask, a 24-bit image. Then they
are used to create the tile, using the alpha channel for the shape,
the image for the colors, and the bitmask for walkability. I need
those items to load IN THAT ORDER so that I can at least draw the
shape and get the walkability even if the tile hasn't compeletly
loaded yet. I wanted to compress them all together to make things
smaller.

Maybe I am just asking too much lol! Isn't there a way to
just convert a string of data into an imageobject? Thanks for any
help.